Hello Luigi, Stephen and Patrick,


thanks for your reactions.
At home I tried to process the example (08-01-2012) of Stephen with the
TeXLive2011 version of context, but I got the same errors as the stable and
the beta version of context. Thanks for the report of how to compile something
with svn.
Which person will ever buy  "Hans's"-keyboard, that of
http://www.artlebedev.com/everything/optimus/popularis
almost 10 euro for each key. I like it to give my lectures at a blackboard with
chalk. At the blackboard I  design my own keys, infinitely many,